97521637 has 2 divisors, whose sum is σ = 97521638. Its totient is φ = 97521636.

The previous prime is 97521617. The next prime is 97521647. The reversal of 97521637 is 73612579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96805921 + 715716 = 9839^2 + 846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97521637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97521637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97521607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48760818 + 48760819.

It is an arithmetic number, because the mean of its divisors is an integer number (48760819).

Almost surely, 2^97521637 is an apocalyptic number.

It is an amenable number.

97521637 is a deficient number, since it is larger than the sum of its proper divisors (1).

97521637 is an equidigital number, since it uses as much as digits as its factorization.

97521637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 97521637 is about 9875.3044003717. The cubic root of 97521637 is about 460.2922481264.

The spelling of 97521637 in words is "ninety-seven million, five hundred twenty-one thousand, six hundred thirty-seven".